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《Plant Protection》 2014-03
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Effects of wheat cultivar mixtures on powdery mildew,wheat yield and grain protein content

Xu Tao;Xu Zhi;Xu Yuan;Duan Xiayu;State Key Laboratory for Biology of Plant Disease and Insect Pests,Institute of Plant Protection,Chinese Academy of Agricultural Sciences;  
To provide a theoretical basis for the use of mixed planting of wheat cultivars against powdery mildew, the effects of diversified cultivars,selected after wheat SSR analysis,on wheat powdery mildew,the ear weight, one-thousand kernel weight and the crude protein content of wheat were studied.Based on SSR analysis of 37 wheat cultivars and the field performance of the resistance to powdery mildew,eight cultivars were selected and 26 mixtures with three,four,five,six or eight cultivars and their pure stands were tested and arranged with randomized blocks.Artificial inoculation of powdery mildew was applied in the field.The changes of AUDPC value,ear weight and protein content were investigated.The results indicated that the genetic distance was different between the eight cultivars.The four-cultivar mixture displayed the smallest AUDPC with the highest ear weight.The AUDPC value of cultivar mixture was decreased with the proportion of disease-resistant cultivars.Approximately73%of the cultivar combinations had an effect on powdery mildew.The range of control efficacy was 1.23%-56.65%.The cultivar mixtures did not show negative effects on ear weight,1000-kernel weight and the protein content.Therefore,if the mixtures are properly combined,cultivar mixtures can be used as a measure for powdery mildew control.
【Fund】: 国家重点基础研究发展计划课题(2011CB100403、2006CB100203);; “十一五”国家科技支撑计划课题(2006BAD08A05);; 公益性行业(农业)科研专项(3-15)
【CateGory Index】: S512.1
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